Heat treatment process for improving low temperature plasticity of selective laser melting forming GH4169 alloy

Abstract

The invention belongs to the technical field of heat treatment of additive manufacturing advanced aerospace materials, and particularly relates to a heat treatment process for improving low temperature plasticity of a selective laser melting forming GH4169 alloy. The heat treatment process is used for significantly improving low temperature plasticity. The heat treatment process comprises the steps that 1, homogenization heat treatment is carried out on the selective laser melting forming GH4169 alloy; 2, solid solution heat treatment is carried out on the selective laser melting forming GH4169 alloy obtained after homogenization heat treatment; and 3, aging heat treatment is carried out on the selective laser melting forming GH4169 alloy obtained after homogenization and solid solution. According to the heat treatment process, the high temperature homogenization process is additionally arranged before conventional solid solution, system optimization is carried out on the heat preservation temperature and the holding time parameter of all processes, the ultra-low temperature plasticity of the selective laser melting forming GH4169 alloy is greatly improved, is greatly improved from10.5% to more than 20%, and is far higher than the design index requirements, it is ensured that the comprehensive mechanical properties of the products meet the design specification requirements, and the urgent need of the model to the materials is met.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of advanced aerospace materials for additive manufacturing, and specifically relates to a heat treatment process for improving the low-temperature plasticity of GH4169 alloy formed by selective laser melting, which is used to significantly improve its low-temperature plasticity. Background technique [0002] Selective laser melting forming GH4169 high-temperature alloy products have been widely used in heavy-duty launch vehicle engines under development in my country. Compared with forging + machining forming, this technology can significantly reduce the number of parts to achieve weight reduction. At the same time, this technology has the characteristics of near net shape Greatly reduce economic and development cycle costs. At present, the two types of heavy-duty engines are all liquid hydrogen and liquid oxygen engines, and the ultra-low temperature environment of liquid hydrogen and liqui...

AI Technical Summary

Problems solved by technology

During the development and production, the low-temperature (-196°C) performance test of the selected area laser melting and forming GH4169 product after conventional heat treatment found that its low-temperature plasticity is low, which is far from meeting the design requirements, making it difficult to deliver the product in time and delaying the model development cycle.